<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <title>问卷完成</title>
    <style>
        body {
            font-family: sans-serif;
            text-align: center;
            padding: 2rem;
        }
    </style>
</head>
<body>
    <h1>问卷已成功提交！</h1>
    <p>感谢您的参与。</p>
</body>
</html>
